I thought the fad was ice cream or yogurt up the vagina.
I never heard about the ice cream or yogurt. I do know Paltrow was hawking rocks on social media but stopped when a couple of OB-GYNs wrote an article about the dangers because they were seeing women and girls in their offices who were doing the rock up the vagina thing and ending up with severe infections.
Some of Paltrow’s more outrageous health and beauty tips.
https://graziadaily.co.uk/beauty-hair/wellness/gwyneth-paltrow-quotes-health-hacks/